Teen pregnancy, birth and abortion rates in the United States have dropped 51 percent since their peak in 1990, and 15 percent in just the last two years, according a new study by the Guttmacher Institute.

Pregnancies among 18- and 19-year-olds make up the majority of teen pregnancies, the report found, and increasing proportions of 18- and 19-year-olds said they have had sex.

The declining pregnancy rate is “great news,” Kathryn Kost, the study’s lead author, said in a released statement.

“Other reports had already demonstrated sustained declines in births among teens in the past few years; but now we know that this is due to the fact that fewer teens are becoming pregnant in the first place. It appears that efforts to ensure teens can access the information and contraceptive services they need to prevent unwanted pregnancies are paying off.”

New Jersey’s teen pregnancy rate ranks it 32nd in the nation, with 92 pregnancies per 1,000 women, ages 18-19. The state teen birth rate ranks it 46th nationally, with 38 births per 1,000 women, ages 18-19. Its teen abortion rate is the third-highest in the nation, with 42 abortions per 1,000 women, ages 18-19.